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annotate src/lzfu.c @ 109:7947334d53ad

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Added tag stable-0-6-21 for changeset 1b2a4fac1303
author Carl Byington <carl@five-ten-sg.com>
date Tue, 21 Oct 2008 14:45:39 -0700
parents 582e927756d3
children 6395ced2b8b2
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1 /*
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2 This program is free software; you can redistribute it and/or modify
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3 it under the terms of the GNU General Public License as published by
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4 the Free Software Foundation; either version 2 of the License, or
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5 (at your option) any later version.
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6
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7 You should have received a copy of the GNU General Public License
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8 along with this program; if not, write to the Free Software Foundation,
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9 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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10 */
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11
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12 #include "define.h"
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13 #include "libpst.h"
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14
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15 #include <sys/types.h>
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16 #include <string.h>
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17 #include <stdio.h>
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18
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19 #include "lzfu.h"
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20
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21 #define LZFU_COMPRESSED 0x75465a4c
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22 #define LZFU_UNCOMPRESSED 0x414c454d
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23
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24 // initital dictionary
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25 #define LZFU_INITDICT "{\\rtf1\\ansi\\mac\\deff0\\deftab720{\\fonttbl;}" \
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26 "{\\f0\\fnil \\froman \\fswiss \\fmodern \\fscrip" \
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27 "t \\fdecor MS Sans SerifSymbolArialTimes Ne" \
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28 "w RomanCourier{\\colortbl\\red0\\green0\\blue0" \
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29 "\r\n\\par \\pard\\plain\\f0\\fs20\\b\\i\\u\\tab" \
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30 "\\tx"
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31 // initial length of dictionary
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32 #define LZFU_INITLENGTH 207
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33
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34 // header for compressed rtf
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35 typedef struct _lzfuheader {
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36 uint32_t cbSize;
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37 uint32_t cbRawSize;
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38 uint32_t dwMagic;
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39 uint32_t dwCRC;
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40 } lzfuheader;
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42
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43 char* lzfu_decompress(char* rtfcomp, uint32_t compsize, size_t *size) {
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44 unsigned char dict[4096]; // the dictionary buffer
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45 unsigned int dict_length = 0; // the dictionary pointer
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46 lzfuheader lzfuhdr; // the header of the lzfu block
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47 unsigned char flags; // 8 bits of flags (1=2byte block pointer into the dict, 0=1 byte literal)
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48 unsigned char flag_mask; // look at one flag bit each time thru the loop
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49 uint32_t i;
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50 char *out_buf;
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51 uint32_t out_ptr = 0;
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52 uint32_t out_size;
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53 uint32_t in_ptr;
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54 uint32_t in_size;
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55
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56 memcpy(dict, LZFU_INITDICT, LZFU_INITLENGTH);
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57 memset(dict + LZFU_INITLENGTH, 0, sizeof(dict) - LZFU_INITLENGTH);
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58 dict_length = LZFU_INITLENGTH;
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59
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60 memcpy(&lzfuhdr, rtfcomp, sizeof(lzfuhdr));
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61 LE32_CPU(lzfuhdr.cbSize);
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62 LE32_CPU(lzfuhdr.cbRawSize);
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63 LE32_CPU(lzfuhdr.dwMagic);
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64 LE32_CPU(lzfuhdr.dwCRC);
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65 //printf("total size: %d\n", lzfuhdr.cbSize+4);
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66 //printf("raw size : %d\n", lzfuhdr.cbRawSize);
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67 //printf("compressed: %s\n", (lzfuhdr.dwMagic == LZFU_COMPRESSED ? "yes" : "no"));
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68 //printf("CRC : %#x\n", lzfuhdr.dwCRC);
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69 //printf("\n");
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70 out_size = lzfuhdr.cbRawSize;
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71 out_buf = (char*)xmalloc(out_size);
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72 in_ptr = sizeof(lzfuhdr);
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73 // Make sure to correct lzfuhdr.cbSize with 4 bytes before comparing
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74 // to compsize
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75 in_size = (lzfuhdr.cbSize + 4 < compsize) ? lzfuhdr.cbSize + 4 : compsize;
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76 while (in_ptr < in_size) {
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77 flags = (unsigned char)(rtfcomp[in_ptr++]);
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78 flag_mask = 1;
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79 while (flag_mask) {
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80 if (flag_mask & flags) {
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81 // two bytes available?
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82 if (in_ptr+1 < in_size) {
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83 // read 2 bytes from input
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84 unsigned short int blkhdr, offset, length;
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85 memcpy(&blkhdr, rtfcomp+in_ptr, 2);
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86 LE16_CPU(blkhdr);
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87 in_ptr += 2;
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88 /* swap the upper and lower bytes of blkhdr */
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89 blkhdr = (((blkhdr&0xFF00)>>8)+
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90 ((blkhdr&0x00FF)<<8));
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91 /* the offset is the first 12 bits of the 16 bit value */
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92 offset = (blkhdr&0xFFF0)>>4;
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93 /* the length of the dict entry are the last 4 bits */
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94 length = (blkhdr&0x000F)+2;
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95 // add the value we are about to print to the dictionary
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96 for (i=0; i < length; i++) {
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97 unsigned char c1;
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98 c1 = dict[(offset+i)%4096];
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99 dict[dict_length] = c1;
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100 dict_length = (dict_length+1) % 4096;
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101 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1;
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102 // required for dictionary wrap around
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103 // otherwise 0 byte values are referenced incorrectly
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104 dict[dict_length] = 0;
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105 }
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106 }
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107 } else {
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108 // one byte available?
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109 if (in_ptr < in_size) {
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110 // uncompressed chunk (single byte)
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111 char c1 = rtfcomp[in_ptr++];
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112 dict[dict_length] = c1;
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113 dict_length = (dict_length+1)%4096;
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114 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1;
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115 // required for dictionary wrap around
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116 // otherwise 0 byte values are referenced incorrect
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117 dict[dict_length] = 0;
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118 }
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119 }
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120 flag_mask <<= 1;
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121 }
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122 }
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123 *size = out_ptr;
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124 return out_buf;
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125 }